If you need to visually inspect your Christmas lights to determine which are good and which need replacement, there are a few things to look for. First, look for discoloration, such as a dark spot or two on the inside of the glass. The spot is an indication of a burnt filament. Also, look for missing filaments, cracked bulb glass, and broken sockets.

Heavy amounts of snow could be a problem. In many climates, lots of snow on your rooftop can lead to freeze-thaw cycle that create ice dams, which can damage rooftops. But if you’re using shingle clips, this snow poses an additional problem: As it melts and freezes, it can easily dislodge clips you’ve placed on your roof.

You can clean snow off your roof after a fresh snowfall while it’s still lightweight, but brushing off snow can also dislodge your clips. If you get a lot of snow, then roof clips become less viable.

The type of lighting you choose can have a big part in the aesthetic and function of your space. Ambient lighting refers to indirect or diffused lighting that evenly reaches most areas of the space. Task lighting illuminates specific areas, such as a workspace. Accent lighting draws attention to details in your home, and decorative lighting draws attention to itself.

When it comes to bang for your buck, LED lights are the clear winner for Christmas lights. While these will cost more upfront, they’ll last you for many holidays to come—far longer than your basic halogen bulbs. Along with that, they also save you big on energy costs throughout the season.